The Open: Dustin Johnson on a mission to prove his quality
Dustin Johnson has challenged himself to prove how good he is and get into contention for The Open title.
The World No.2 finished his second round at Royal Troon on two under, eight shots off the lead, after shooting a two-under-par 69.
After two double bogeys, the winner of last month's US Open came in strongly with three successive birdies on the back nine and he wants to maintain the momentum.
The 32-year-old American said: "I went into the gorse on seven, had to re-tee, and the same on 11 - I hit a good shot but it swirled out of bounds. Other than that I played really well.
"Those holes on the back nine are tough, but to birdie 15, 16 and 17, I feel I got a little momentum. I felt like I swung it really well and hit a lot of great shots, so I'm looking forward to the weekend.
"Tomorrow I am going to have to go out and shoot a good score, for sure. I know I'll be off pretty early in front of the leaders.
"I've got to go out and post a number. I've got 36 holes to see how good I am."
Johnson's playing partner Martin Kaymer did not cope so well as the rain rolled in.
Kaymer was two under at the turn, but followed a triple bogey at the 10th with a bogey at 11 to card a two-over 73, leaving him at three under overall.